Thank you for your heart-felt message.
For those of us who regularly work with the body-mind-emotion continuum, there's no question that the build-up of inner negativity eventually carries over into and creates most if not all of the body's physical illnesses. This inner negativity has an energetic basis, and so can be related to the energy body, the chakras, and the pranic system. The energetic negativity becomes known to us as feelings and emotions, so when we are working on a feeling level, we are not only affecting our emotional health, but most directly our physical well-being.
A case like yours would definitely be karmic, especially since it occurred at an early age. Even if there were outside factors that might be pointed to as contributing to the condition, it makes no difference. You attracted and were susceptible to any such influences because of your karmic predisposition. As you mention, I prefer to view karma as the carry over from the past of the suppressed subconscious. Feelings/energies that were not released come with us into the new life and attract or create appropriate circumstances in order to be worked out.
So - working on a feeling level with the intention to clear the negative subconscious is, I would say, a most effective route to healing the physical. There are other modalities that work on an energetic level, such as Pranic Healing, with which I am familiar, that can be helpful as well. I always encourage people to try any modality they are attracted to. But I tend to believe that any form of energetic healing must include releasing into awareness the trapped feelings involved. When you are experiencing Pranic Healing then, it is reasonable to expect that feelings will be coming up if the healing is having an effect. You can't assume that you will just be 'healed' without your participation; working with the feelings is a critical way you participate. At that point, you apply the ECP protocol to the feelings, because if you don't they will be just re-suppressed; simply having them come into awareness is not enough to bring about the cleansing of the subconscious. This principle applies to any type of energetic healing. In this way, ECP integrates with any valid form of energy work, as well as being effective on its own.
I had a client a few years ago, with whom I worked for about 8 months. He was diagnosed with prostate cancer. At the end of our work, the cancer appeared to be in remission. In checking with him some years later, it was still not a problem. He was also doing many other things such as diet, supplements, yoga, breathwork, etc., but our work was the primary psychological/medical intervention. He never did chemo or radiation or surgery, which is what was advised by his doctor. Here's how we worked; it's actually quite interesting: As we surveyed his emotional landscape, it became apparent that his core emotional issues were based in the Power chakra, which in my schematic is located in the perineum, which is close to the prostate. I would say that the energetic negativity in the Power center had carried over to the nearby prostate, weakening it and making it susceptible to the cancer. The Power center feelings were that of being controlled, manipulated, dominated, used, mostly in the workplace. These are the feelings we addressed, using ECP. We also sent light to the prostate and brought witnessing consciousness to it. My presence as the facilitator accomplishes much the same thing as a Pranic Healer would, since I am consciously sending prana, or the light, to all clients as we work together. Indeed, all forms of energetic healing could be thought of as being very similar in how they work.
For you, I would advise a similar approach. Learn the ECP system, find out what your core feelings are, which chakras they are connected to, and do the work. I'm not sure what chakras would correlate to your particular condition, but as you get into it, it will start to become apparent. Energetic assistance from others can be helpful, but I always make a point of saying that you can do the work on your own. Is any condition incurable? I would tend to agree with you. There will always be an end point. At the same time, everyone doing this kind of work on themselves must realize that we are undertaking a momentous task in clearing the residue of many lifetimes, and it is going to take time. But when you start working, you realize that that's enough - knowing you are going forward, experiencing the gradual expansion of the soul.